Insulator mounting



Nov. 17, 1953 c. J. FoTv INSULATOR MOUNTING Filed May 23, 1950 Fis. 1

Patented Nov. 17, 1953 UNITED STATES PATENT OFFICE INSULATOR MOUNTING Chin Jim Fot, Logan, W. Va., assignor to Guyan Machinery Company, Logan, W. Va., a corporation of West Virginia Application May 23, 1950, Serial No. 163,746

2 Claims. 1

This invention relates to an improved type of insulating structure for use in electrical devices.

It has been the practice in the past to make resistor units having end plates made of a pressed liber insulating material. It has been found that these end plates do not stand up satisfactorily in service.

There is a need for a simple construction permitting the use of metal end plates in such resistor units. It is imperative that the insulators associated with the metal end plates be reliably secured in place. It is also desirable that the individual resistance elements be easily replaceable in the resistor unit.

According to the present invention, the end plates are formed from metal plates having a plurality of punched openings which receive insulators of a simple form. These insulators, preferably of a ceramic material, are supported in these openings and are retained against removal by a novel locking means.

Fig. 1 is a fragmentary, sectional View of a resistor unit embodying the invention.

Fig. 2 is a fragmentary view of an end plate showing the preferred form of the insulator receiving opening.

Fig. 3 is a face view of one of the bushing type insulators embodying the invention.

Fig. 4 is a side view of that insulator.

Fig. 5 is a face View of a terminal clip used in conjunction with the invention.

Fig. 6 is a side View of that terminal clip.

Fig. 7 is a perspective View of a modied type of terminal clip.

The resistor unit has end plates II which are provided with punched openings l2. As shown in Fig. 2 the margin of these openings I2 is provided with slots t3. The bushing type insulators I4 are provided on their outer peripheries with projecting lugs I5. A circumferential channel I6 is formed in these lugs. The axial opening I'I through the insulator I4 has a square crosssection.

The terminal clip I8 shown in Figs. 5 and 6 is provided with two projecting bosses I9 which have a square section. The bosses I9 are dimensioned to it the openings I1 thus preventing rotation between these parts when assembled. The bosses I5 are provided with openings 23 which are preferably square in cross-section. The second form of terminal clip 2| has an upturned connecting flange 22. This clip 2| is provided vvith a single square boss 24 having an opening 25.

Disposed between alined openings I2 in the CFI.

end plates II are coil resistance elements 25. The ends of these elements 26 have flat Washers 21 welded thereto. Extending outwardly through the washers 21 are carriage bolts 28 having the conventional square shank portions 29. These Ebolts 21 pass through the openings 23, or 25 in the terminal clips and are secured by the nut and Washer as generally indicated at 3 I Insulators I4 are axially inserted into adjoining openings l2 in one end plate (the left end plate as seen in Fig. 1) with the lugs I5 and slots I3 alined. When the channel I 6 is alined with the plate II, the insulators I4 are turned 90 whereby portions of the plate II are retained in the channel I6. The terminal clip I8 is then put in place with the bosses I9 extending in the openings I1 in adjoining insulators I4.

The engaging surfaces of the l"bosses I9 and the openings I'I need not be square. Any noncircular connection whereby the insulators are securely held against rotation will suice. After the insulators are in place in the plate II, resistance elements 26 are inserted through the corresponding openings in the opposite end plate II and bolted to the terminal clip I8. The square shank 29 of the carriage bolt provides a convenient method of holding the bolt against rotation during this operation.

The length of the bosses I 9 is such that the insulators I4 are not subjected to compression. With the resistance elements 26 thus secured at one end, insulators I4 are put in place in the other end plate II and locked. Terminal clips of either type may be associated with the resistance elements 26 at this end. A modified type terminal clip ZI is shown secured to the lower resistance element 26 in Fig. l. This element 26 is securely held against rotation by the square Shank 29 of the carriage bolt which engages the opening 23 in the terminal clip I8. Therefore, when the terminal clip 2l is bolted in place the insulator I4 will be held against rotation and unlocking.

While the preferred embodiment has been described in considerable detail, it will be apparent that the 'basic concept of using a, non-rotating conductor to secure an insulator in its locked position could be used in a variety of structures. No limitation to these details is implied.

l claim:

l. ln an electrical device the combination of an apertured supporting plate, a rigid insulator supported in an aperture in said plate, the periphery of the insulator and the margin of said aperture being formed with inter-engaging aesavee lugs and. slots o the bayonet look type so ar ranged that the insulator be inserted axially and thereafte' looked in place against axial withdrawal. by a preti-ei'A ine i partial rotation 01:' the insulator about its a saisi isulator navnon-circular ape re there a concluemember having,f a portion snap i. to said ion-enculer aperture ant?. engaged therein to inhibit relative rotation of t. eoncluetor ineinber and the insulator; and means serving to hola sai@` conductor member against rotation, and thus inhibiting rotation of said insulator.

2. In eieetrical devise the combination o a sup-.porting plate liavinff at least two spaced similar apertures; two ii -uiators supported in said spaced apertures, the periphery or each insulator anal the margin of the aperture engaged thereby being formed with inteiwengfaging lugs and slots of the bayonet loot: type so arranged that each insulator be inserted axially in the oo1iesoncling aperture and then may be .leaked place a predetermined partial rota- 4 tion about its axis, each insulator having a noncircular aperture therein; and a conductor member having two portions spaced apart so as to en" ter the non-circular apertures in respective in sulators after the insulators are in place, the entering portions of the conductor being nonciroular so as to engage the insulators and prevent rotation of each.

CHIN JIM EOT,

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,085,200 Foard Jan. 2'?, 1.91/1 1,697,317 Kyle Jan. 1 1929 1,828,281 Cralobs Oct. 20, 1931 1,932,456 Gaston Oct. 31, 1933 2,468,737 Davis May 3, 1949 2,494,814 Huth Jan. 17, 195D 2,592,130 Erb et a1. Apr. 8, 1952 

